import random
import re
from datetime import datetime

from flask import request, abort, current_app, make_response, session, render_template, g
from flask.json import jsonify

from . import news_blu
from ... import db, constants
from ...models import User, News, Comment, CommentLike
from ...utils.common import user_login_data
from ...utils.response_code import RET


@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    user = g.user

    # 获取点击排行
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    # 定义空列表，存每条新闻的字典
    news_dict_li = []
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 获取新闻详情
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        abort(404)
    if not news:
        abort(404)
    news.clicks += 1
    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        abort(500)


    # 评论查询
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id==news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    # 点赞查询
    comment_like_ids = []
    try:
        comment_ids = [comment.id for comment in comments]
        comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids), CommentLike.user_id==user.id).all()
        comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
    except Exception as e:
        current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        comment_dict['is_like'] = False
        if comment.id in comment_like_ids:
            comment_dict['is_like'] = True
        comment_dict_li.append(comment_dict)
    # 是否关注当前作者
    is_followed = False
    # 收藏显示
    is_collected = False

    if user:
        if news in user.collection_news:
            is_collected = True
        if news.user.followers.filter(User.id == user.id).count() > 0:
            is_followed = True
    data = {
        'news': news.to_dict(),
        'user': user.to_dict() if user else None,
        'news_dict_li': news_dict_li,
        'is_collected': is_collected,
        'comment_dict_li': comment_dict_li,
        'is_followed': is_followed
    }
    return render_template('news/detail.html', data=data)


@news_blu.route('/news_collect', methods=['post'])
@user_login_data
def news_collect():
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 1.接受参数
    news_id = request.json.get('news_id')
    action = request.json.get('action')

    # 2.判断参数
    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    if action not in ['collect', 'cancel_collect']:
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='查询数据失败')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    if action == "cancel_collect":
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        if news not in user.collection_news:
            user.collection_news.append(news)
    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='修改失败')
    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blu.route('/news_comment', methods=['post'])
@user_login_data
def comment_news():
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")
    # 1.取参数
    news_id = request.json.get('news_id')
    comment_content = request.json.get('comment')
    parent_id = request.json.get('parent_id')

    # 2.判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')

    # 查询数据，判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='查询数据失败')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    # 3.初始化一个评论模型，并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据修改失败')
    return jsonify(errno=RET.OK, errmsg='ok', data=comment.to_dict())


@news_blu.route('/comment_like', methods=['post'])
@user_login_data
def comment_like():
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")
    # 1.取参数
    comment_id = request.json.get('comment_id')
    action = request.json.get('action')
    # 2.判断参数
    if not all([comment_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    if action not in ['add', 'remove']:
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    try:
        comment_id = int(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    # 3. 获取到要被点赞的评论模型
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='查询数据失败')
    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论不存在")

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,CommentLike.comment_id==comment.id).first()
        if not comment_like_model:
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            comment.like_count += 1
    else:
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据修改失败')

    return jsonify(errno=RET.OK, errmsg="OK")


@news_blu.route('/followed_user', methods=['post'])
@user_login_data
def followed_user():
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")
    user_id = request.json.get('user_id')
    action = request.json.get('action')
    if not all([user_id,action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    if action not in ['follow', 'unfollow']:
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    try:
        user_id = int(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数有误')
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='查询数据失败')
    if not other:
        return jsonify(errno=RET.NODATA, errmsg="用户不存在")
    if action =='follow':
        if other not in user.followed:
            user.followed.append(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户已被关注")
    else:
        if other in user.followed:
            user.followed.remove(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户未被关注")

    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据修改失败')

    return jsonify(errno=RET.OK, errmsg="OK")

